[RFC PATCH 06/11] drm: Expose fb_id property for writeback connectors

[Brian Starkey]

Expose the framebuffer for writeback connectors to userspace by
attaching the fb_id property to them.

Signed-off-by: Brian Starkey <brian.star...@arm.com>
---
 drivers/gpu/drm/drm_atomic.c    |    9 +++++++++
 drivers/gpu/drm/drm_connector.c |    4 ++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index b16b4fc..82e8e3a 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -986,12 +986,19 @@ int drm_atomic_connector_set_property(struct 
drm_connector *connector,
                 * now?) atomic writes to DPMS property:
                 */
                return -EINVAL;
+       } else if (property == config->prop_fb_id) {
+               struct drm_framebuffer *fb = drm_framebuffer_lookup(dev, val);
+               drm_atomic_set_fb_for_connector(state, fb);
+               if (fb)
+                       drm_framebuffer_unreference(fb);
        } else if (connector->funcs->atomic_set_property) {
                return connector->funcs->atomic_set_property(connector,
                                state, property, val);
        } else {
                return -EINVAL;
        }
+
+       return 0;
 }
 EXPORT_SYMBOL(drm_atomic_connector_set_property);
 
@@ -1022,6 +1029,8 @@ drm_atomic_connector_get_property(struct drm_connector 
*connector,
                *val = (state->crtc) ? state->crtc->base.id : 0;
        } else if (property == config->dpms_property) {
                *val = connector->dpms;
+       } else if (property == config->prop_fb_id) {
+               *val = (state->fb) ? state->fb->base.id : 0;
        } else if (connector->funcs->atomic_get_property) {
                return connector->funcs->atomic_get_property(connector,
                                state, property, val);
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 027d7a9..fb83870 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -249,6 +249,10 @@ int drm_connector_init(struct drm_device *dev,
                drm_object_attach_property(&connector->base, 
config->prop_crtc_id, 0);
        }
 
+       if (connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+               drm_object_attach_property(&connector->base,
+                                          config->prop_fb_id, 0);
+
        connector->debugfs_entry = NULL;
 out_put_type_id:
        if (ret)
-- 
1.7.9.5

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